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When dealing with filesystems that come from block devices we can get a noticeable performance gain in some use cases from having the block cache enabled. The code paths are valid in other cases when we have BLK set and may provide wins in raw reads in some use cases, so have this be default when BLK is enabled. Signed-off-by: Tom Rini <trini@konsulko.com>
48 lines
1.7 KiB
Plaintext
48 lines
1.7 KiB
Plaintext
config BLK
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bool "Support block devices"
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depends on DM
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default y if DM_MMC
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help
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Enable support for block devices, such as SCSI, MMC and USB
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flash sticks. These provide a block-level interface which permits
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reading, writing and (in some cases) erasing blocks. Block
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devices often have a partition table which allows the device to
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be partitioned into several areas, called 'partitions' in U-Boot.
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A filesystem can be placed in each partition.
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config HAVE_BLOCK_DEVICE
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bool "Enable Legacy Block Device"
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help
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Some devices require block support whether or not DM is enabled
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config SPL_BLK
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bool "Support block devices in SPL"
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depends on SPL_DM && BLK
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default y
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help
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Enable support for block devices, such as SCSI, MMC and USB
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flash sticks. These provide a block-level interface which permits
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reading, writing and (in some cases) erasing blocks. Block
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devices often have a partition table which allows the device to
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be partitioned into several areas, called 'partitions' in U-Boot.
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A filesystem can be placed in each partition.
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config BLOCK_CACHE
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bool "Use block device cache"
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depends on BLK
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default y
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help
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This option enables a disk-block cache for all block devices.
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This is most useful when accessing filesystems under U-Boot since
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it will prevent repeated reads from directory structures and other
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filesystem data structures.
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config IDE
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bool "Support IDE controllers"
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select HAVE_BLOCK_DEVICE
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help
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Enables support for IDE (Integrated Drive Electronics) hard drives.
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This allows access to raw blocks and filesystems on an IDE drive
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from U-Boot. See also CMD_IDE which provides an 'ide' command for
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performing various IDE operations.
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